Cutter-head.



E. s. SHIMER.

CUTTER HEAD.

- APPLICATION FILED 001.. 2, 1909. 1,000,850. Patented Aug. 15, 1911;

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; TiruTnn STATES PATENT orraon ELMER S. SHIMER, OF MILTON, PENNSYLVANIA, ASSIGNOR TO SAMUEL J. SI-IIIVIER & SONS, OF MILTON, PENNSYLVANIA," A CORPORATION.

CUTTER-HEAD.

Specification of Letters Patent.

Patented Aug. 15, 1911.

To all whom it may concern:

Be it known that I, ELMER SSHIMER, a citizen of the United States, residing at Milton, in the county of, Northumberland and State of Pennsylvania, have invented certain new and useful Improvements in Cutter-Heads, of which the following is a specification. I

My invention relates to an improvement in cutter heads, and the object is to provide means for fastening the cutter head firmly upon the spindle upon which it is intended to work.

When one piece of metal is bored to fit snugly upon another, as a shaft or spindle, there must be a slackness of two to three one-thousandths of an inch between the two sizes. This is called a sliding fit. It is this kind of fitting that is customary in attaching cutter heads to a spindle of a matching or molding machine. The customary means of fastening them to the spindles is by set screw at the side. Vhen the set screw is drawn tight, that much of the slackness allowed for sliding fit in the here will be forced eccentric in relation to the cutters, and although a mere trifle in actual measure ment, the cutter upon the head flange having the longest radius will do about all of the cutting, thus giving a finish to the work by means of one cutter making one cut on each revolution, whereas, if the head was equally centered, and all cutters setting upon an equal radius, the finished surface would show in-cuts divided by all of the cutters, and thus present to the eye a superior finish. To overcome this defect, which is common to all cutter heads, I have provided a sliding taper sleeve divided with radial slots for expansion, and which is provided with a threaded upper portion fitting a special nut at the top, forming a portion of the head hub for drawing the sleeve into the head along the spindle, whereby the head will be firmly locked or fastened upon the spindle.

The invention consists in certain novel features of construction and combinations of parts which will be hereinafter described and pointed out in the claims.

In the accompanying drawings :-Figure 1 is a vertical sectional view, Fig. 2 is a view in side elevation of the tapering sleeve, Fig.

3 is an end view thereof, Fig. 4 is an end view of the cap or top of head member, and Fig. 5 is a detail of the spiral spring pawl.

A, represents the cutter head, and B, is the annular flange formed thereon, which is provided with cutters 1, 1. The bore of the head has a taper which extends toward the upper end thereof. A ball-race 2 is formed near the top of the head which is provided with an opening 3, for admitting the balls to the race. Below the ball-race 2, a shoulder 4 is formed upon which is mounted a spiral spring pawl 5, the free end of which projects upwardly, and is adapted to engage the flanges 6 formed in the top member or cap 7 The cap 7 is adapted to be received in the head member A, and is provided with a shoulder 8, adapted torest upon the top of the head member. A ballrace 9 is formed in the cap below the shoulder 8 which is adapted to register with the ballrace 2 forming a rest for the balls 10 which are received in the ball-races 2 and 9. The opening 3 is intended to be closed with Babbitt metal or solder, after the balls have been inserted when the cap and head are connected together. The balls permit of the cap revolving within the head and overcome the friction between two members in turning. An integral nut 11 is formed upon the top of the cap for rotating the cap in the head. Extending through the nut 11 and top of the cap, is a screw-bolt 12 by which the vertical adjustment of the cutter head is attained. The end of the bolt will engage the end of the spindle (not shown) for obtaining the proper vertical adjustment of the head, after which adjustment is attained, the head is then fastened to the spindle.

A tapered sleeve C, is received in the bore of the head A, and the taper of the sleeve conforms to the taper of the head. That is, the sleeve has a vertical taper. The sleeve is provided with radial slots 13. After the vertical adjustment has been obtained for the head, by means of the bolt 12, and the bolt has been locked in position by the nut 1A thereon, the head is ready to be fastened to the spindle, which is accomplished by cap 7 being rotated by the nut 11, whereby the screw-threads 15 on the interior bore of the cap will engage the exterior screw-threads 16 on the sleeve C. As the cap is rotated,

the sleeve will be drawn into the head between the spindle and head, and the flexible lower ends of the sleeve are forced centrally strain, until the head is loosened from the spindle, and the forcing strain is reversed. Then the balls exert their influence in forcing the centrally tapered sleeve downwardly through the threads on the upper end of the sleeve, and those of the upper hub member or cap 7. The drawing of the tapering sleeve up into the head A, and cap 7, produces a uniform fastening of the head upon the spindle; in other words, there is no possible danger of the head being turned whereby the cutters will be shifted from the position obtained by the vertical adjustment through the bolt 12. Of course, a re-adjustment or a re-set-ting may be necessary to compensate for wearing of parts. The looking of the head A upon the spindle will be of such uniformity that there will be no danger of the head being moved in the slightest degree, whereby the cutters can be thrown out of alinement, and thereby allowing one cutter to do the entire work.

Having fully described my invention,

what I claim as new and desire to secure by Letters Patent, is

1. The combination with a cutter-head having a tapered bore and a tapering contractible sleeve located within theb'ore of the cutter-head andhaving screw-threads, of a cap rotatably connected with the cutterhead and provided with screw-threads which register with the threads of the sleeve, said cap in addition to its connection with the cutter-head and sleeve constituting a closure of one end of the cutter-head while inclosing and incasing theend of the sleeve.

2. The combination with a cutter-head having a tapered bore, of a tapering contractible sleeve located within the bore of the cutter-head and provided with screwthreads, of a cap having threads which engage the threads of the sleeve, said cap inclosing the end of the sleeve and constituting a closure at the corresponding end of the cutter-head, and means interposed between the cap and head which admits of one rotating while precluding endwise movement with respect to the other.

In testimony whereof I aflix my signature,

in the presence of two witnesses.

ELMER S. SHIMER.

Witnesses:

W. H. BECK, JOHN A. MOFARLAND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

